#include <stdio.h>
struct X {char a[8];};
struct X salutation(void){
    struct X result={"Hello"};
    return result;
}
struct X addressee(void){
    struct X result={"world"};
    return result;
}
int main(void){
    printf("%s,%s!\n",salutation().a,addressee().a);
    return 0;
}